Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 13. EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) 05. Air-Fuel (A-F) Control System

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05. Air-Fuel (A-F) Control System


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W1860BE.book Page 8 Tuesday, January 28, 2003 11:01 PM




                                            AIR/FUEL (A/F) CONTROL SYSTEM
 EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)


 5. Air/Fuel (A/F) Control System
   The air/fuel (A/F) control system makes a correction to the basic fuel injection duration in accor-
 dance with the signals from the front oxygen (A/F) sensor and the rear oxygen sensor so that the
 stoichiometric ratio is maintained, thus ensuring most effective exhaust gas purification by the three-
 way catalytic converter. Different basic fuel injection durations are preset for various engine speeds
 and loads, as well as the amount of intake air.
   This system also has a learning control function which stores the corrected data in relation to the
 basic fuel injection in the memory map. This allows an appropriate air-fuel ratio correction to be add-
 ed automatically in quick response to any situation that requires such an effect. Thus, the air-fuel
 ratio is optimally maintained under various conditions while purifying exhaust gases most effectively,
 improving driving performance and compensating for changes in sensors' performance over time.




                                                         EC(H4DOTC)-8



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